Work-holder.



NVENTEIR.

E. R. DARLING.

WORK HOLDER.

APPLICATION FILED FEB. 20. 1915.

Patented Oct. 5, 1915.

v ii

EDMUND R. DARLING, OF WOONSOCKEI, RHODE ISLAND.

l1 WORK-HOLDER.

Specification of Letters Patent.

Patented Got. 5, 1915.

Application filed February 20, 1915. Serial No. 9,580.

To all whom it may concern:

Be it known that I, EDMUND R. DARLING, a citizen of the United States, residing at Woonsocket, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Work- Holders, of which the following is a specification.

This invention relates to certain new and useful improvements in work holders, and pertains more particularly to a work holder used in connection with a grinding or sharpening machine or apparatus.

The primary object of the invention is to provide a work holder which can be easily and quickly operated to, both clamp and release the work; to provide a work holder which is operated by a hand lever; to provide a work holder in which a single lever operates a plurality of work clamps or work holding jaws; and to also provide means whereby the work may be easily and quickly presented at different angles to the grinding wheel or other sharpening device.

Further and other objects of the invention will later appear and be manifested in the course of the following description.

In the drawingsFigure 1 is a side elevation, partly in section, showing the man ner in which the invention is employed in connection with a grinding wheel. Fig. 2 is a perspective view, and Fig. 3 is a frag mentary enlarged detail view.

The invention includes a base 1 having a pair of upwardly-extending lugs 2 through which passes a horizontal rod 3, the rod being appropriately secured to the lugs 2. The rod 3 acts as a means of pivotal support for the work holder proper which latter consists of a pair of end yokes or C- shaped members 4: connected by means of rod 5 at the fronts of the members 1 and a rod 6 at the rear of the members. The members 4 have upper hollow vertical parts or ends 7 in which latter plungers 8 acted upon by springs 9 are slidingly received, the plungers being connected by means of a cross bar 10 the bar sliding in slots 12 which receive the ends of the bar and are formed in the members 1. The plungers 8 form movable or slidable jaws disposed in confronting relation to rigid jaws 13 formed by the lower free ends or portions 14 of the members 4. As shown more particu larly in Fig. 1, of the drawings, the bar 10 is engaged by a cam lever 15, the latter being pivoted to the rod 3 and bearing upon the upper edge of the bar 10. The free end of the lever 15 is slotted at 16 to receive a rack bar 18, the inner end wall of the slot being engageable with the teeth of the rack bar as depicted in said Fig. 1. The rack bar or toothed arm 17 is pivoted upon the rear rod 6, and is pressed by a spring 18 which abuts a projection 19 formed on the arm 17, and seats on a short arm 20 rigidly secured to the rod 6, Arm 20 has a threaded aperture inwhich engages the upper end of an adjusting pin 21, the lower end of which has threads of a pitch opposite to the pitch of the threads at the upper end thereof and engages in a rotatable post 22 secured to bosses 23 carried by the base.

The present invention is designed particularly for use in sharpening or grinding skates, as shown in dotted lines in Fig. 1, and in operation it is merely necessary to adjust the adjusting pin or threaded bolt 21 to move the work holder proper about its pivot 3 in order to present the work to the grinding wheel W at the desired angle. By manipulation of the lever the movable or slidable jaws can be actuated to open or close same so as to firmly grip the work, the lever being locked in closed position by the teeth of the arm 17 engaging therewith in an adjustable manner. The springs 9 normally force or urge the slidable jaws 8 upwardly so that as soon as the pressure of the lever 15 is relieved on the bar 10, the springs will move the jaws 8 to up or open position. It will thus be apparent that the jaws 8 are moved in unison and that the entire structure, including both of the jaws can be bodily swung about rod 3 to present the work at varying angles to the grinding wheel.

While the present invention is especially adapted for use in grinding skates, still it is obvious other work can be held therewith equally as well.

Having thus described my invention, I claim as new and desire to secure by Letters Patent;

1. In a work holder, a base having upwardly extending lugs thereon, a horizontal rod secured to the lugs, a pair of C-shaped members pivoted on the rod, a pair of rods connecting the members, each member having an upper spring pressed slidable jaw, a cross bar connecting the jaws and slidable at its ends in slots provided in the member therefor, a cam lever IHOIlIIliQCl'OlI one of thepair of rods to move the cross bar downwardly, means to. swing'the members'about the first mentioned rod so as to present the work at different angles, and means borne by the other rod of the pair of rods to lock series of spring pressed jaws borne thereby,

and means to actuate the jaws in unison.

4. In a work holder, a holder proper, a series of spring pressed jaws borne thereby, a cam lever for actuating all of the jaws in unison, and means to lock the lever.

5. In a Work holder, a movable jaw, a

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

eam lever for moving the'jaw to Work engaging position, said lever having a pro-- jection and a pivoted. spring pressed toothed member for engagement With the lever proj eetion to hold the lever locked.

6. In a work holder, a series 01"? slidable aws, a cross bar connectlng the ]&WS, a cam lever for actuating the cross bar by engagement therewith, and a spring pressed toothed arm for engagement With the lever.

7. In combination with'a work holder, a series of slidable jaws thereon, and means to actuate the jaws in unison including a single lever.

In testimony whereof I have signed my nameto this'speeification in the presence of two subscribing witnesses.

R. DARLING.

V EDMUND lVitnesses ADA E. HAGERTY, J. A. MILLER.

Washington, D. 0. 

